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Now why would they do that?

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  • Now why would they do that?

    Sheesh...my cutter grinder project is on hold. I lost/misplaced the nuts for the sliding "T" bolts for my swivel table (from my broken vise). Thought it was no big deal I have hundreds of 1/2"X13 tpi nuts. Only thing...it turns out these are 1/2"X12 tpi. I looked in every store that may have them yesterday and everything was 13tpi. Nobody had a 1/2"X12 tap. I don't feel like making new "T" bolts. What a pain. WHY 12tpi???
    Hoping the bolt place will have some. Nice! Get to drive through a snow storm for two stinking nuts! Oh well...they could be 11 1/2 tpi I suppose
    Now WHO dreamed THAT one up?
    Russ
    I have tools I don't even know I own...

  • #2
    1/2"x12 tpi was Whitworth thread used all over the world for over 100 years still used on British made machines until metric system was introduced into Britain in the early 1970s
    MBB

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    • #3
      Just use some regular nuts and stretch them a bit until they thread on.
      Free software for calculating bolt circles and similar: Click Here

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      • #4
        Originally posted by Evan
        Just use some regular nuts and stretch them a bit until they thread on.
        Mine usually do that on their own when they warm up.
        - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

        It is true, there is nothing free about freedom, don't be so quick to give it away.

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        • #5
          I wonder why it's called screwing? Broaching is more like it.
          Free software for calculating bolt circles and similar: Click Here

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          • #6
            1/2-12 was also used in the 19th century in the US. It hasn't been used here since the very early 1900s. Unless they're Whitworth, you don't have a snowball's chance of finding any more...and finding Whitworth nuts would be quite a challenge.
            ----------
            Try to make a living, not a killing. -- Utah Phillips
            Don't believe everything you know. -- Bumper sticker
            Everybody is ignorant, only on different subjects. -- Will Rogers
            There are lots of people who mistake their imagination for their memory. - Josh Billings
            Law of Logical Argument - Anything is possible if you don't know what you are talking about.
            Don't own anything you have to feed or paint. - Hood River Blackie

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            • #7
              When I was a teenager I was building a ham radio transmitter. I had misplaced a little flat bladed screwdriver that I needed. I thought it dropped into some cardboard boxes under the workbench. I dumped everything into the middle of the floor but nothing. I looked for another hour before coming into the house all po'd and threw myself down on the couch. My dad said "what's wrong bud?" I told him I lost the only screwdriver that would work for what I had to do on my transmitter. He got up out of his chair and walked over to me and reached in my shirt pocket and said, "you mean this one?"

              Have you checked your pockets? LOL

              Or, since no one else has mentioned it, have you looked in the last place you had it? I'm sure that's where you'll find it unless it has legs of it's own. LOL
              Last edited by Your Old Dog; 12-27-2006, 11:17 AM.
              - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
              Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

              It is true, there is nothing free about freedom, don't be so quick to give it away.

              Comment


              • #8
                Make a tap.
                Free software for calculating bolt circles and similar: Click Here

                Comment


                • #9
                  Originally posted by Evan
                  Make a tap.
                  LOL!...If they don't have any nuts...I'm going to hack the weird ones off and tig new bolts into the square flanges.
                  I have tools I don't even know I own...

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                  • #10
                    Just think of it as an anti-rotation nut

                    How about turning down the end a short distance and threading them for a 3/8" or 7/16" thread? Drop a spacer or washers on it and you can save the rest of the 12 pitch thread ... but I'm not sure why
                    Last edited by nheng; 12-27-2006, 11:30 AM.

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                    • #11
                      Saw off the existing stud. Drill and tap the tee nut for 1/2-13. Buy a stud the correct length. Locktite the stud in the tee nut. Reassemble the vise and use it. On the other hand, you can buy a 1/2-12 tap from MSC and make a nut.
                      It's only ink and paper

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                      • #12
                        Got it! I looked closer at the "T" bolts. They welded studs into them anyway. I ground off their lil' bit of weld..punched the studs out and welded in new ones with 1/2"X13 threads. I still don't see why the Chinese would do this. All the other fasteners on the vise are standard everyday course thread bolts.
                        They must have got a good deal on some dies on Ebay
                        Russ
                        I have tools I don't even know I own...

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                        • #13
                          Chinese, you say...are they metric?
                          ----------
                          Try to make a living, not a killing. -- Utah Phillips
                          Don't believe everything you know. -- Bumper sticker
                          Everybody is ignorant, only on different subjects. -- Will Rogers
                          There are lots of people who mistake their imagination for their memory. - Josh Billings
                          Law of Logical Argument - Anything is possible if you don't know what you are talking about.
                          Don't own anything you have to feed or paint. - Hood River Blackie

                          Comment


                          • #14
                            One reason the thread may be an odd ball is companies loved to do this stuff. Special screws for their machines so if you lost or broke them you had to go to them to buy one (or two/three/whatever). When was the last time you saw a 1/4-24 or 3/8-18/20? Plus when there were no standards machine designers just used what ever they darn well felt like.
                            Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.

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                            • #15
                              If this is a Chinese unit we're talking about, those threads are not by design. I've run into this quite a few times in different sizes. Its just really bad, super shoddy manufacture. I recently got one of those Deckel copy SO grinders, and there were threaded holes and bolts so sloppy, who know what configuration they were. I went back and heli-coiled all of them to a standard size. We just got some barstools(chinese) and the bolts used metric allen keys, but threaded 1/4-20.
                              Last edited by daryl bane; 12-27-2006, 11:46 PM.

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